Dovetaltlng-machine for preparing edges of parts of electrotype or stereotype



m0 Model.) 2 sneetpsheet 1.

E. G. WILLIAMS. I DOVETAILING'MAGHINE FOR PREPARING ED'GES 0P PARTS OFELBGTROTYPE 0R STEREOTYPE PLATE .BLOGKS. N ik 531,241. Patented'Dec. 18

(No Model.) 2 Sheets- Sheet 2.

E. o. WILLIAMS. DOVETAILING MACHINE FOR PREPARING EDGES 0F PARTS OFELEGTROTYP B 0R STEREOTYPE PLATE BLOCKS.

' No. 531,241. Patented Dec. 18, 1 94.

UNITED; STA PATENT OFFICE.

EDWARD o. WILLIAMS,

OF CHICAGO, ILLINOIS.

DOVETAIIING-MACHINE FOR PREPARING EDGESCOF PARTS Of ELECTROTYPE ORSTEREOTYBE PLATE BLOCKS.

SPECIFICATION forming part or Letters ma No. 531,241, dated December 181894.

Application filed May 29, 1893.

To all whom it may col Learn.-

Be it known that I, EDWARD C. WILLIAMS, 7 of Chicago, Cook county,Illinois, have invented certain'new and useful Improvements inDovetailing-Machines' for Preparing the Edges of the Parts ofElectrotype or Stereotype Plate Blocks, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, and to the letters and figures of referencethereon.

My invention relates to a machine used more particularly for preparingwooden bases for mounting stereotype plates, and its object is toaccomplish a saving of labor and timein the manipulation of the machine,and to make the adjustment of the parts therefor positive and not liableto the inaccuracies of eye measurements: substantially as hereinaftermore fully described, and as illustrated in the drawings, in which-Figure 1, is a plan view of my invention, showing the corners of thebed-plate nearest the bottom of the sheet broken away. Fig. 2, is avertical longitudinal section of the same,

taken on dotted lines 2,- 2, Fig.1. Fig. 3,-is a plan view of the gageadjusting devices, with all of the bed-plate except that supporting saiddevices, broken away. Fig. 4, is a vertical longitudinal sectionof thesame, taken on dotted line 4, 4, Fig. 3, looking in the directionindicated by the arrows. Figs. 5'and 6, show, respectively, a side andplan view of the burr used in connection with my invention. Fig. 7, is adetail view of the dove-tailing burr, and Figs. 8 and 9, are detailviews showing the construction of the block.

In the drawings A represents the tableframe which supports the devicesof my invention, and which consists of four legs, that are connected attheir tops by the rectangular frame A, which about its center of widthhas its end rails connected by a cross-bar (1.. Passing vertically upthrough a tapped portion of the cross-bar a near its junction with therear rail is a screw B, and projecting forward from the corners'of thefrontend rail of the rectangular frame A are lugs 12, b, to which thelugs c, 0, depending down from the bed-plate O, are pivotally connectedby means of a sta tionary shaft (1. By manipulating the screw B thebed-plate may be inclined at an angle of naled.

Serial No. 475,915. (No model.)

a greater or less degree according as desired. Made longitudinally inthe bed-plate at about its center of length, and a distance removed fromthe right hand side edge ofthe bed-plate equal to about one-third thewidth thereof, is a slot 2, up through which a circular saw D revolves.This saw is secured to the end of a shaft D, which is j'ournaled in oneof the side rails ofthe rectangular frame A and crossbar a, and isdrivenby' means of a belt 2 from the main shaft; said beltbeing directeddownward, around an idle pulley 3, and around a pulley 4, so as to clearother mechanism, and so as to. impart motion to the drive-shaft 5 uponwhich said pulley 4 is mounted and secured, as shown inthe drawings.

Secured by means of a set-screw 6 to, and depending down from the shaftd are corresponding arms 1'', the ends of which are connected to asuitable spindle 7, on which lat-.

ter a couple of idle sheaves 8 are loosely jour- These pulleys 8, guidethe belt 9, which is driven by the pulley 10, on shaft 5, to the sheave12 on the lower end of the burr spindle 13, and this burr spindle 13, isjournaled in the bearings in the bracket E. Its

construction, with reference to the latter, will be explainedhereinafter more fully. Suffice it to say that it carries in its upperend a burr F, which passes through a suitable opening in the bed-platelocated in longitudinal alignment with the slot e.

The wooden blocks which are to be operated upon by the saw and burr,consist of a main slab 15, which has its end edges secured in, andreinfor'cedby' the transverse strips 16 of the same thickness. Thestrips 16 are united to the slab by a dove-tail mortise, which,in orderto bring the broad surfaces of the slab and strips on the same planemust be made very accurately; the tenons on the end edges of the slaband the grooves in the contiguous meeting edges of the transversestrips. To make the groove the strip '16 is fed longitudinally to andover the saw, so that the kerf made thereby will be in the edge thereofbetween the broad sides of the same, and then to and over the burr,which entering the kerf made by the saw completes the groove into theshape required. It would be almost impossible for these blocks to be fedby hand so as to obtain satisfactory results, without having some meansof guiding them. I have therefore provided a longitudinal fence or guardplate G which is placed alongside and parallel with slot e so as to forma straight longitudinal guide against which the operator keeps one edgeofthe block whilemoving the same over the saw and burr. The slab 15 isfed endwise to the saw so as to provide an initial rabbet in the edgenext the side farthest from the guard plate, and then fed to and pastthe burr which gives the rabbet an under cut shoulder. The slab is thenturned so as to bring its opposite broad side next the saw, and an undercut rabbetis made in the other side of said end edge in the same way,thus leaving the dove-tail tenon in relief. Instead of doing this,however, the guard-plate may be adjusted so that the saw and burr wouldoperate in the edge nextthe side bearing against the guard-plate, andthus permit the block to be fed in one position, and the grain of thewood cut in the same direction all the time. This would require thelateral adjustment of the guard-plate in such manner as to bring theedge ofthe said block which it was desired to operate on in properregister with the saw. I accomplish this ad j ustment of the guard-plateby securing it-to the contiguous end of the longitudinally shifting barg, which is journaled in andguided by the split guide bearings h securedto and arising from the plate G, which rests upon and is secured to thebed-plate, substantially as shown in the drawings. Arising from thisplate G, preferably, nearest the end farthest from the saw isapivotalstud I-I upon which is fulcrumed the lever I. The long arm ofthis leverprojects toward the front of the machine to within convenient reach ofthe operator, and terminates in a suitable handle so as to afford him aneasy grasp thereon. The short arm of said lever extends to and over theshifting bar 9 and is provided with longitudinal guides 1', i, on itsupper surface, between which is placed and adjusted the block J. Thisblock is capable of a slight longitudinal adjustment commensurate withthelength of a longitudinally elongated opening it down through which aset-screw K passes to-secure the same to the short arm of said lever.The block J has connected to its upper surface near its inner end thelongitudinal rod 101., the other end of which latter extends through asuitable eye in a lug projecting from the collar M, which is securelymounted upon said shifting bar at a point'nearer the guardplate. The eyethrough which this bar at passes is slightly greater in diameter thanthe said rod, which latter is provided with a tudinally so as to movethe guard-plate toward or from the slot 6. As stated heretofore thereare practically three positions in which it is necessary for theguard-plate to be moved to, namely: first, the position necessary tomake the longitudinal central groove in the transverse end strip of theblock; second, the position which will enable a rabbet to be made in theend edge ofthe main slab of the a block farthest from the guard-plate;and, third, the position which will enable the saw to make a rabbet inthe edge of said block nearest the guard-plate. The position of thelever as shown in Fig. 1, would enable me to place the guard-plate in.the position necessary to make the central groove in the edge of thetransverse strips. lever as shown in dotted lines indicated by m in Fig.3, would enableme to place the guard-plate in such position as to makethe rabbet-in the edgeof the main slab farthest removed from saidguard-plate; and the position indicated by the dotted lines y in Fig. 3,would place-the gnard-plate in sucha position as to make therabbet inthe edge of said slab next said guard-plate. As it would be inconvenientto hold the lever I in any of the positions indicated by hand,I haveprovided three openings at, 01', M, in the jbed-platainto any one ofwhich I shoot a vertical bolt N, when the said lever is in such positionthat thesaid bolt registers with any one of said openings. Thisverticalibolt extends vertically down through a suitable passage made in saidlever and in a foot idepending downward from said lever and resting uponthe bed-plate, and has its upper end suitably engaged by the short armof a thumb lever o, the trunnions of which are ijournaled in suitablebearing lugs arising from the neck of the handle, and the longer arm ofsaid thumb lever extends out overthe handle of thelever I and has aspring 7' under it, the tendency of which is to keep said thumb lever insuch positionas to insure the bolt shooting into any one of the openings'11, n, 01 when it comes in register therewith. This bolt holds thelever in any one of the three positions it may beplaced in, and leavesthe operator free to use his hands in manipulating the work.

I11 order to insure the perfect relative adjustment of the saw D and theburr F, so that when the bed-plate is inclined so that the saw will makebuta shallow incision, the said burr will not out too deeply into theelectrotype block, I have given to saidburr a slight verticaladjustment. This I accomplish by tapping the squareshank of the burrcentrally and longitudinally, and then setting it into thesquare socketin the upper end of the burr spindle 13, ma'dewith reference thereto.

through the longitudinal central opening in The position of the the saidspindle to' and into the tapped opening in the shank of the burr. Thespindle is provided near its upper end with a circumferentia-l flangewhich rests in a suitable seat in the upper end of the longitudinallyadjustable sleeve R, and it has secured to its lower end a sheave 12.The sleeve R has, preferably, a circumferential flange on or near itslower end, the edges of which are milled so as to afford a suitable handgrasp, and it is screw-threaded a suitable distance up from this flangeso as to mesh and engage with the female screw-threaded portion of theopening in the bracket E, up through which said spindle passes. Byadjusting this sleeve adjustment the burr is given a slight vertical upor down as desired.

I have shown in Figs. 5 and 6 a construction of the burr, but 'as I layno particular In a stereotype block dove-tailing machine,

the combination with the cutting devices, of

the bed plate, the guard-plate, bar g, collar M having a lug projectingtherefrom which is provided with a suitable rod 0%, lever I, the

short arm of which is provided with guides i, 2', block J adjustablelongitudinally between said guides, and having a longitudinallyelongated opening therein, and set-screw K, said rod m connecting saidcollar M, and block J, as set forth.

EDWARD O. WILLIAMS.

Witnesses:

HARRY G. BROWNELL,

FRANK D. THOMASON.

